Shooting Proton Torpedoes at Capital Ship Command Towers and Space Station Bottom awards you auto "Destroy Command Center" Bonus.
One Torpedo Always blows the Targeted Area.
lv 50 here. just want to say that it is not the most efficient way to get credits if you only have a limited amount of play time per day.
per se, there are 4 repeatable daily non-group quest on one of the final planets. those 4 quests yield a total of about 50k credits in less than 30 mins time (yes, it is that easy).
---------- Post added 2012-01-03 at 10:49 PM ----------
The torpedo tube requires lv 50, 30? commendations.
after testing, there is one obj (or 2?) gives an extra commendation for blowing up the command tower, another bonus obj gives about 1k extra credit.
i regret getting the tube immediately after testing -
don't take my word for it, try googling 'proton torpedo tube' and see what other people say...
As already mentioned, they unlock with level. It keeps the old missions interesting as you level up as there are more objectives.